2158346817 has 30 divisors (see below), whose sum is σ = 3543968274. Its totient is φ = 1308083040.

The previous prime is 2158346783. The next prime is 2158346833. The reversal of 2158346817 is 7186438512.

2158346817 is a `hidden beast` number, since 2 + 1 + 583 + 4 + 68 + 1 + 7 = 666.

It can be written as a sum of positive squares in only one way, i.e., 2155837761 + 2509056 = 46431^2 + 1584^2 .

It is not a de Polignac number, because 2158346817 - 2¹² = 2158342721 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2158346867) by changing a digit.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 100308 + ... + 119909.

Almost surely, 2^2158346817 is an apocalyptic number.

2158346817 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

It is an amenable number.

2158346817 is a deficient number, since it is larger than the sum of its proper divisors (1385621457).

2158346817 is a wasteful number, since it uses less digits than its factorization.

2158346817 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 220251 (or 220231 counting only the distinct ones).

The product of its digits is 322560, while the sum is 45.

The square root of 2158346817 is about 46458.0113328154. The cubic root of 2158346817 is about 1292.3309451443.

The spelling of 2158346817 in words is "two billion, one hundred fifty-eight million, three hundred forty-six thousand, eight hundred seventeen".